• 1. data access logic components: 数据访问逻辑组件

• 1.Logical tiers divide the conceptual architecture into components that play specific roles within the application, such as presentation, application logic, business processes, and data access.
  逻辑层将概念体系结构划分为在应用程序内扮演特定角色的组件，如表示层、应用程序逻辑层、业务流程层和数据访问层。
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• 2.Spring framework is used to tie together the components in the Data Access Layer, the Business Logic Layer, and the Presentation Layer.
  Spring框架用于将数据访问层、业务逻辑层和表示层中的各组件结合在一起。
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• 3.Developers use this pattern to separate low-level data access operations from high-level business logic. A typical DAO implementation has the following components.
  开发人员用这种模式将底层数据访问操作与高层业务逻辑分离开。
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